I think the one holding its tail up is a hen and the one holding down is a roo, the possible roo looks like it has spurs growing and the other hasn't (i'm not clued up on whether the hen's of this breed can get spurs though)

Left cockerel, right pullet. The cockerel's tail is starting to grow in, he is also thicker in neck & body. You kind of just get an eye for sexing over time. Better (closer) pictures would get you more accurate answers though as I could be wrong due to the distance & stances.

I say that both of them are roosters. At three months of age, their combs would not be that big, nor would they be such a bright red. Both of them also have very long, thick legs. I even see that one of them is sporting some really big spurs, too!